By Jean-Pierre Laude
Modern source offers you complete, modern insurance of the rules, applied sciences, criteria and functions of Dense Wavelength department Multiplexing (DWDM).
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Extra info for DWDM Fundamentals, Components, and Applications
The function T(x ′y ′) limited to S2, corresponds to the amplitude transmission function of the fiber F2.
1 dB, temperature range: 0°C to −65°C. Narrow filters for a few 50-GHz-spacing channels can be made. 1 Introduction Wavelength division multiplexers using filters cannot be used when the number of channels is too high or when the wavelengths are too close. The main advantage of the grating is the simultaneous diffraction of all wavelengths, so that it is possible to construct simple devices with a large number of channels. A diffraction grating  is an optical surface, which transmits or reflects light and on which a large number of grooves N0 (several tens to several thousands per millimeter) are ruled by a diamond tool or obtained by holographic photoetching.
And at a distance f from the waveguide grating exit we get a position shift of the maximum: dx = f dθ. 4) Free-Spectral Range We have seen that the wavelength center is lv 0 = nc DL/m. In AWG, the diffraction order m is generally large (typical mean value m = 60 on 32 channels, 100-GHz spacing AWG). For different values of m we get different wavelengths on the same channel. The minimum distance between these wavelengths is obtained for Dm = + − 1. 5) On the same fiber we get a set of almost equidistant wavelengths separated by lv 0 /m.
DWDM Fundamentals, Components, and Applications by Jean-Pierre Laude